I had a 2012 jetta that had this. It was complete touchscreen with only a couple basic function buttons. I found it extremely annoying to use. To make matters worse, when the flimsy screen got a tiny crack in it, I lost all control of the radio because I could no longer touch to interact with it. I guess that would be a big deal breaker from me if I had means to be in the market for a tesla. I'm not big on having everything in a touchscreen.
The lexus I recently purchased uses a mouse essentially to interact with the screen which I find pleasant to use and also offers a full range of buttons for the radio and climate control. I find this to be a much better experience for myself.
Still, the 'mouse' seems like a poor choice. As the op said - isn't the idea of big dumb buttons that we don't have to take our attention off the road to interact with them?